Typewriting machine



July 18,1944. c. WALKER TYPEWRITIDNG MACHINE Fil ed Nbv. 26, 1942 6Sheets-Sheet 1 InvEnTuR UHARLEs WALKER r I m! ATT ufirrar Jill 18, 1944.

c. WALKER v TYPvEWRiTIN G MACHINE File'd Nov. 26, 1942 I e Sheets-Sheet2 IINE HT 012 3 UHAHL 5 WALKER 3 2. v

ATT URNEY 1944-1 WALKR ,353,860

' TYPEWRITING MACHINE I Filed Nov. 26, 1942 s Sheets-Shet 4 InvEnTnRATTmmEY c. WALKER 2,353,860

TYPEWRITING MACHINE Filed Nov. 26, 1942 I6 Sheets-Sheet 5 mm; ATT mm EYm m. NA W .w v 5 m: 3 L. o a n A H @w fi/ B W 2 a 0 3 6 9E/5 3 56 3 a a4 a .3/ a 4 5 f 6 4 8 9 w 7 .2 w w 0 July is, 1944.

July 18, 1944. c. WALKER TYPEWRITING MACHINE Filed Nov. 26; 1942sisheets-sheet e IHVENTUR E'HAHL E5 HAL KER A'rrumgEY Patented July 18,1944 TYPEWRITING MACHINE,

Charles Walker, Syracuse, N. Y., assignor to L. C. Smith & CoronaTypewriters, Inc., Syracuse, N. Y., a corporation of New YorkApplication November 26, 1942, Serial No.- 466,989 22 Claims. (01.197-17) The invention relates to improvements in typewriting machines,the general object of the invention being to provide an improved, moreefficient, and more easily operated typewriting machine of the kind inwhich type impressions and concomitant letter space feeding of the paperwhich receives the type impressions are effected under control ofmanually operable type keys by power independent of that exerted by thetypist in depressing the type keys.

The invention relates particularly to improvements in the means wherebytype impressionsand desired letter space feeding of the paper areeffected.

The invention, more particularly, provides improved key-controlledpower-actuated means for effecting selective actuation of the typecarriers of the machine and concomitant letter space feeding of thepaper which receives the type ciently accomplishing the severalaforesaid ends with great ease and a minimum of effort by a typist.

The invention also provides an improved construction and arrangement ofparts (including the keys, the space bar, and adjacent portions of themain frame of the machine) affording an improved keyboard portion orsection of the machine whereby the several keys and the space bar areoperable by the typist with maximum ease, efliciency and comfort, andwhereby the keyboard and adjacent parts of the main frame are soconstructed and arranged as also to enhance the appearance andcompactness of the machine.

Other purposes and advantages of'the invention will appear from thefollowing description in detail of the preferred embodiment of theinvention illustrated in the accompanying drawings.

The invention, to the foregoing ends, comprises the arrangement ofparts, features of constructions and combinations of elements anddevices particularly pointed out in each of the several appended claims.

The drawings illustrate the invention in accordance with a preferredconstruction, hereinafter particularly described, whereintheimprovements are incorporated in a known L C Smith typewritingmachine otherwise constructed substantially as is disclosed, forexample, in United States patents to Gabrielson numbered 983,490,1,018,968, 1,032,131, and 2,029,200, it being understood that saidimprovements may be embodied in other machines.

In the drawings;

Figure 1 is a fragmentary top plan View of the improved machine, certainparts being omitted and others broken away for clarity of illustration.

Figure 2 is a fragmentary vertical longitudinal sectional View takensubstantially medially of the machine, certain parts'being broken awayand others omitted.

- Figure 3- is a detail sectional view taken approximately on the line33 of Figure 1 and showing features of .the keyboard.

Figure 4 is a detail sectional view taken on the line 4-4 of Figure 3. l

Figure 5 is a detail sectional View taken on'the' line 5-5 of Figure 3.

Figure 6 is a fragmentary front elevation of the keyboard portion of themachine.

Figure 7 is a detail sectional view taken on the line of Figure 3.

Figure 8 is a detail sectional view taken approximately on the line 8-8of 'Fig'ure'9.

Figure 9 is a detail view, partly in section approximately on the line9-9 of Figure 8, showing parts of the key-controlled power mechanism ofthe machine. I

Figure 10 is a detail sectional View taken on the line l0|0 of Figure 9.

Figure 11 is a detail sectional view taken ap- Figure 14 is a detailsectional View taken ap proximately on the line I4l4 of Figure, 1 andshowing parts of the key-controlled power mechanism of the machine.

The illustrative embodiment of the invention 1 shown'in the drawingswill now be described.

The machine illustrated has a suitable stationary main framework,portions of which are shown, said framework being generally designatedby the reference numeral H3. The machine is provided with the usualroller platen H journaled in the usual platen carriage I2 which, inturn, is mounted on the framework as usual to travel transversely of themachinefor letter feeding or spacing under controlof the usualescapement device. This escapement device comprises the usual feed rackl fixed to the carriage,

the usual feed pinion 2 meshing with said rack,'

" 22 and being secured at their lower ends to a the usual shaft 3journaled in the mainframe and to which is fixed'said pinion Land theusual escapement ratchet wheel 4. the usual escapement dog rocker 5pivoted at 6 on the mainframe and carrying the usual pair of escapementdogs 1 and 8 coactive with wheel 4, theusual spring- 9 drum (not shown)mounted on frame Ill, and the usual draw band (not shown) connecting thedrum to the carriage to normally urge the carriage from right to left orin letter spacing direction.

The type bars l3 of the usual arcuate system of type bars (only onemedial and one end one of which type bars are shown) have their pivots[4 carried by the usual type bar segment carries a lower case type";:and an'upper case type H, the" upwardly and rearwardly inclin'edf typebar segment being shiftable by suitable case shift means (not shown)downward to an upper case typing positionin'which the segment occupies alower position in its inclined plane to condition the machine for uppercase'typing. The means for supporting and shifting the type bar segmentmaybe those disclosed inthe previously mentioned Gabrielsonii-Patent2,028,200, or any other suitable means; Adjacent their forward ends, thetype bars are normally supported by the usual upwardly and rearwardlyinclined arcuate type bar rest I8 which is supported as usual by meansnot shown 'to' shift with the type bar segmentl5. v.

Each type bar has pivoted thereto at I9,Yat a point normally above andforward of its pivot I4, the forward end of a different one of the linksof a series of rigiddrawlinks 20, the rear ends of which are connectedby pivots 2| to the upper ends of the respective ones of a seriesof'sublevers 22, the links being all of the same length. The pivots l9and the pivots 2|, respec-' tively, lie in obliquely disposed parallelarcs which are concentric with 'and 'are disposed in planesparallel'to'those 0f the type bar segment and the series of type barpivots US so that, when the segment is case'shifted, the links 20willhinge about pivots 2| as is common in segment shift machines.

an end one ofwhich areshownyarepivoted in slots in a vertically disposedsegment 94' fixedly held to frame work Land-said sub-levers have Theseveral sub-levers 22 (only a medial and.

being arranged in a straight row extending transversely of the machineforward of the fingers part of the stationary framework ID of themachine. The construction is such that each lever 22" has two arms ofsubstantially equal efiective length."

The lower arm of each sub-lever 22 has pivotally connected thereto atthe lower end thereof at 25 the forward end of a different one of aseries of rearwardly extending couplers or interponents 26, the couplersbeing normally arranged in a straight horizontal row across the machinewith the pivots 25 in axial register for selective swinga ing of thecouplers up and down about a straight horizontal axial line extendingtransversely of the-machine. .Above and to the rear of their piv-0ts,'the couplers have connected thereto the forward ends of a row oftype bar and coupler return springs 2'! anchored at their rear ends to apart of the stationary framework I 0. These springs normally yieldinglyhold the type barsagainst type bar rest l8 and hold thecouplers againsta horizontal and straight coupler rest 28 I which extends transverselyof the machine. The

couplers normally extend to the rear of rest 28 through vertical guideslots in a coupler guide comb 29 which extends horizontally across themachine, said coupler rest and guide comb being mounted on a part of thestationary framework In and being preferably adjustable fore and aft ofthe machine. The rear edge of the coupler rest is undercut-as shown at28, and each coupler is formed with a forwardly facing and forwardly anddownwardly inclined shoulder 30 (Figure 8) normally spaced slightlyrearward of the undercut rear edge of the coupler rest to permit upwardswinging of the coupler about its pivot 25 but engageable with saidundercut'edge by a very slight rebound of the type bar from its rest I8to lock the connected type bar against any appreciable rebound from thetype bar rest. Each coupler 26; is formed with a rearwardly facingshoulder 3| which is slightly undercut at its upper extends horizontallyacross the machine and is journaled at its ends at 35 on the mainframework (0. The cross bar of the actuator normally overlies and isspaced above all of the coupler fingers 32, and the straight forwardedge of this'actuator cross bar is normally located above and slightlyto the rear of the upper ends of coupler shoulders 3|.

;'The actuator 33 constitutes a tappet device which is rockableforwardly a predetermined dis- -*tancc from a normal idle position bymeans of end and is normally located rearward of comb 29' two constantlytensioned pull springs 36i con'-- the 'ratchet'wheel Bil-concentricallywith the conected at their rear ends to the side arms of the actuatorand at their'forward ends to the framework III, to impel a selected typebar by spring power toward printing position for final type impressingtravel of the type bar solely'under. the influence of acquiredmomentum'as hereinafter explained.

The actuator 33 is retracted tonormal position by power superior to thatof springs 36 and. derived from a constantly rotating shaft 49' which isconstantly driven counter-clockwise (as the machine is viewed in Figures2, 8 and by means of an electric motor 9 while the machine is in use.Said motor is fixedly mounted on the framework Ill within the frameworkand is connected to shaft 49 by suitable speed reduction driving means 9also located within the framework Ill. Shaft 49 v extends horizontallytransversely of the machine in rear of the actuator 33, is journaled inthe framework I0, and

has fixed on its right hand end a ratchet wheel Opposite the ratchetwheel 50, and adjacent thereto at the right thereoflthere is journaledin the framework II] a short crank shaft 5!, the

axis of which is coaxial with that of shaft 49. A pitman 52 has its rearend pivotally and detachably connected to the wrist of crank shaft 5i.

and has its forward end pivotally and detachably connected to abracket53 fixed on the cross bar of the actuator 33. The front end ofthe pitman is connected to bracket53 by ashouldered pivot screw 54. Atitsrear end the pitman is formed with a hook 55 (Figure 2) engaged overthe wrist of crank shaft 5!.

rear end which receives the wristof'the crank shaft :and closes thethroat of the. hook, the front end of said plate being detachably heldto the rear section of the pitman 52 by a clamp- Crank shaft 5! isadapted to be clutched or connected with shaft 49, for a part of asinglerevolution, through the medium. of the ratchet wheel 59 and a pawl 59.Pawl 59is pivoted substantially midway its ends on a horizontal pivotscrew Gil extending transversely of the machine and threaded into an armor pawl carrier "6| which, in turn, is fixed on theleft hand end of thecrank shaft 51 to rotate opposite-the right hand face of the ratchetwheel 50f One arm of the pawl has a nose engageable with the teeth ofthe ratchet wheel, and a torsion spring 62 is A retaining plate 56(Figures 2 and 9) has a forked prises the normally upstanding armor'part I2 fixed to and extending above rock'shaft'69, an

upstanding arm 13 having a forked lower end' coiled about a spacingsleeve 62* on the shank of pivot screw and has'its opposite ends engagedwith said arm of the pawl andwith the pawl carrier to normallyconstantly tend to'urge.

the pawl nose into engagement with the teeth of the ratchet wheel.

Means are provided for manually arcuate pawl controlling surface 63which curves downwardly behind and-under the periphery. of

' arm 12 forwardagainst selecting any f desired type bar for actuationand, for causing incident axes of the shafts 49 and 5! and extends aboutsaid axessfor somewhat less than 180 degrees, Thissurfaceis "s0disposedthat the arm of the pawl-=59 opposite the nose carryingqarm ofthe pawl is normally engaged withsaidsllrface adjacent-the upper end ofsaid surface as indicated more clearly in- Figures 8 and 10'130 hold thenose of the pawl'out of engagement with the ratchet. At this point intherevolution of the crank shaft, the wrist thereof is to the rear of- 1carrying arm'il 'is seated upon and held arrested by a spring-cushionedlatching or-stop lever 64 (Figures Band 9); On a working stroke of theactuator 33th'e pawl passes out ofl'engagement with surface 63 at thelower end of said surface and is swung by" its spring into engage-' mentwith the ratchet wheel 50 just before the crank shaft wrist reaches adead center posi v 64 is normallyheld with'the forward end'thereof atthe upperlimit of its motion by means of a stiif spring 61 (Figure 8)which is connected to the rear end'of the lever 64 and to arm 65 and isadapted to yield momentarily under impact of arm 6| on the forward endof the latch or stop lever 64." A universalrelease bar 68 extendsstraightly and horizontally transversely of the machine and is normallylocated intermediate the cross bar of actuator 33 and the fingers-"12formed on the type action couplers 26. This release bar 68'is providedwith rearwardly extending arms fixedthereto adjacent opposite endsthereof and fixed to a rock shaft SSWhich extends horizontallytransversely'ofithe machine at the rear of sai'd bar and is journaled atits ends on framework lilat 69 'A link 10 (Fig-,- ures Sand 9),pivotally connectedat'its rear 'end atl-I to arm 65 near the upperend-of the latter, is adjustably and pivotally connected at its forwardend with an upstanding rock'arm 12 fixed toflrock shaft 69." This latterconnection "compivoted on shaft-'69 for adjustingmovement fore and aftof the machine, a clamping screw which extends through-a slot'l3 in theadjustable arm '13 above shaft fill and'is threaded into 11,connected'toone'of the release bar supporting arms and to theframework-l0, normally returns the release bar 68 and arm 65. toposition the stop 64 in pawl carrier arresting position, said springnormally urging thezupper end of acushion stop 19 held to framework l0.a

Upon upward swinging of any one of the couplers 26 about its piV0t25into-a position placing coupler shoulder 31 in front of, the cross .barof actuator 33 for forward driving of; the upwardly swung coupler by theactuator, thefinger 32 of; theuriwardly swung coupler will;rock releasebarv G8 upward and rearward to disengage stop or. latch 64 from the'pawlrcarrier;6-|- and release? the actuator-"33 for forward movement byits im-- pelling springs 36. I

The pulling force exertible by the pull springs 36 on the actuator 33tocause theflatter' to impel aselected type bar to the printing point ispref-' journaled at its ends on the framework I at 4| in advance ofshaft'34, extends inwardfrom-the right'hand side of the'frai'neworktransversely of the machine to a point near the fore and aft medial lineof the'machine and has fixed thereon near its'innerend a pendent rockarm 42 and near its outer end a forwardly extending rock arm 43 (FiguresLand 14). Arms" 38 and 42 are connected by a rigidfore and aft extendinglink 39:

chine substantially above the axis-of shaft 40, has aforwardly'extendin'g arm connected with arm, 43 by a-pull spring 46and'has an upstanding arm connected by a rigid link 4'! with-theoutwardly extending arm of a bellcrank-48; Bellcrank 48 is pivotedon theframework I 0' for swinging adjustments about a'vertical axis 80.

The bellcrank-48 has a forwardly extending han-' dle arm which isslightly resiliently flexible up and down and provided with a latchingstud o'r pin BI-releasably engageable in either one of an arcuate seriesof holes82 formed in a horizontal latch plate 83 fixed to theframeworklO.

series-of-holes' 82, in the'position shown in Figure 1, preferably hasno tension or only enough tension to prevent accidental disconnection ofthe spring from'its anchorages and, therefore, exerts no appreciableforce on the aotuator'in this adjusted position of the bellcrank. By'swinging the handle arm of bellcrank 48 out-- wardlyand latching it inone or the other of,

the remaining holes 82, the springAB'may have imposed thereon a normaltension which'will vary with the hole in whichthe pin8I is engaged.

The spring tension thus imposed on spring 46 will be imposed on theactuator 33 in addition to that imposed by springs 30 to therebyincrease the type bar impelling force exertible by the actuator.

' The release bar 68 is operablefrom any one of the type keys I00 of thekeyboard of the machine to release the actuator 33 for a singleadvancing and retracting actuation of the actuator. Y

The type keys I00 are arranged in four rows across the machine and arefixed on the upwardly and forwardly extending front ends of short" andparallel fore and aft extending type key levers IOI which have alsoupstanding rear'ends. The upstanding rear ends'of the key levers IOI arefulcrumed' in slots I02 in a straight horizontal barI03 fixed "to theframework I0 and extending transversely of the machine close to the rearend of the keyboard and below the forward end of the system of typebars, the key levers being fulcrumedion a straight horizontal pivot'IIPforward against a straight horizontal cushion A bellcrank lever44,'which ispivotedon the framework Mat 45 .to'rocka bout a hori-'zontal axis extending transversely 'of the' ma-' Holes 82 are-arrangedin an arc struck from axis 80.

Spring. 46, when the handle arm'of'bellcrank 48 is latched-in the holeat the inner end of the wire I04 carried by bar I03 and extendingthrough all of the slots I02.

Below thesegment' 94' and the lower ends of sub-levers 22, a straighthorizontal bar I05 fixed 5 to framework I0 extends transversely of themachine, is provided with a series of vertical slots I06 across itsfront edge, and carries a straight horizontal fulcrum wire I01which'crosses all of said slots I06. Engagedin slots I06 and fulcrumedon wire I01 are identical sub-levers I08 (one for each key lever), saidsub-levers lying in parallel vertical planes disposed fore and aft ofthe machine. Each sub-lever I08 has an arm which extends downwardly fromits fulcrum and is formed with a rearwardly projecting portion extendingunder bar I05 and coupler rest 28 and also extending through theactuator bail 33 be-' portion of the associated one of the key leversIOI adjacent the lower end of said key lever portion. Links IIO are allof the same length, and lugs III are permanently adjustably bendablefore and aft of the machine. The front ends of the links are pivoted tolugs III at l The links IIO for key levers supporting different banks ofkeys are connected to the pendent parts of the lower arms of thesub-levers I08 at different elevations at I09 I09 I03 and I09 for thefirst or rear, second, third, and fourth or front banks of keys,respectively, for uniform key dip and uniform rocking of the sub-levers.

To the rearwardly extending portion of the lower arm of each sub-leverI08 is anchored the rear end of one of a row of return springs I I2,

the forward ends of which are anchored to framework I0, to restore thesub-levers, links IIO lever I08 has an upper and short upstanding stop HThe fore and. aft extending portion of each type key 1ever"IOI is formedwith a pendent'stop lug II4, which is permanently adjustably bendablefore and aft of the'machine and'normally abuts the rear face of acushion stop device II5 to limit M return movement of the key lever. Thestop device II5 extends straightly and horizontally across the machinebelow the forward portions of the key levers and is clamped in fore andaft adjusted position to the framework I0 by suitable W screwsas II6which extend through fore and aft extending slots. in the stop deviceand are threaded into the framework, as shown in Figurec3. vA verticallyslotted key lever guide comb H1 is fixed to framework I0 immediatelyforward of the stop device II 5 for up and down,

movement of the fore and aft extending portions of the type key leversin the slots of said comb,

the key levers for the rear row of keys having their fore and aftextending portions extended v forward of their upturned key carryingportions 5 for engagement in the comb, asshown in Figure 3.

The rearwardly extending portion of the lower armof each sub-lever I08has pivoted thereon at I I 8 a normally upstanding and fore-and-aftrockable two-armed, coupler-lifting thrust lever H9, the lower arm ofwhich thrust lever is connected by one of a row of return springs I20 tothe rear end of said sub-lever arm portion to normally w hold the upperarm of the thrust lever H9 urged and key levers IM to normal position.Each sub stop' I21 Pad I2I is fixed to'a-thrustilever guide comb I22which is held toframework Ill and extends horizontally and straightlyacross the .ma-

chine. Each thrust lever H9 has a laterallyfbent upper end portionengageable with but a single associated. oneof the couplers 26, itsupper end being normally spaced slightly beneath the finger 32 of theassociated coupler. The-rearwardly extending portion of the lower arm ofeach sub-lever I98 is also formed with a rearwardly extending stop lugI23 fwhich isaperrnanently bendable upland down-and is adapted to "riseinto contact ewitha straight horizontal cushionstop pad I24 toe limitthe movement of the sub-lever by depression of the type key on theassociated keylever and also limitlthe extent of depression of said key,the said stop pad I24 extending transversely 'of the -machine and beingfixed to the underface of comb I22.-

- ..Upon depression and release of :any one of the type keys, itsassociated type bar is actuated to effect a single type impression andtoreturn -'to and remain-in normal position whether or not the key ispromptly released. Depression ofthe selected type key lifts'theassociated thrustlever H9, which thereupon. rocks the associated coupler6 upwardly about its pivot25i to place coupler shoulder 3| immediatelyin front of the cross-bar of actuator or tappet device 33 andsimultaneously cause finger 32 of said coupler to rock the release bar68 upwardly to shift latch 64 rearwardlyvout of engagement withpawlcarrier Bl to release the actuator 33. Springs 36 thereupon instantlypull the actuator forward .at highspe'ed to the limit of the forwardstroke of 'theactuator thereby driving the coupler forward with a springimpelled tappet action of the actuator on the lifted coupler. At thelimit of the forward stroke of the actuator, the sub-lever finger 22*?contacts the associated cushioning rest '23, thus freeing both therelease (bar r68 and'the latch device 6465 for instant move ment-back tonormal position by spring 111' for arresting the pawl carrier 6| by thelatch device 64+65 at the end of a single revolution-of the pawlcarrier. On'the return stroke of the type bar by springs 24and2'Lthe'couplerslides under the release bar,- and, if the type key isstill. held depressed, the-coupler finger 32. will abut the upper arm oflifting lever i I9 androck the samerearward below the returned releasebar and, when the key is finally released, the

lever H9 will be restored to its normal position .by the associatedspring I29. If the keyis .released instantly aftervfull' depressionthereof, the :coupler finger 32; will move rearward between thereturned. release bar 68 and the returned lifting lever' H9 into: thenormal position of the finger and coupler. JJust before the actuator'isfully advanced by its impelling springs 361(or 36 'and 46),-'-the pawl.59 passes out of contact with surface "63 at'the lower forwardlendmofsaid surface and itsnosesnapsinto engagement .is kickedzoutiof.engagement with the ratchet by coming :intocontact; with the upper endof surface 63 As the pawl is disengaged from the ratchet, itscarrier"arm;6,i impacts the restored yieldable-stop'fi i and is finallybrought to rest "lOJcy said-"stop-at the starting point or normalposition of the. carrier 1 arm. The actuator is thusflp'o'sitiyelyretracted to normal idle position againstthe resistance of-springs 36(or 36 and t6), and the-selected type bar will make but one impressionirrespective .of the length of time its controlling-type key is helddepressed.

Meansi are provided whereby the escapement of .the machine .-is.normally operable by the type bar! actuator .forefiecting a letter spacefeed of the platen carriagev concomitantly with each type impression,but whereby any selected one,

, or plurality oflselected ones, of the type actions may functioncasaccent, silent or'dead type actions, i. e.,type. actions-operable toprint with- 5 outcausinga letter 'feed movement of the carriage; Means.are .also provided whereby the escapement. may be manually operated bythe .spacerbarof the machine."

The dog rocker5 *carries the usual adjustable retuinstop I25-engageablewith a part of framework Ill-todetermine the normal-position of the dogrocker; said. rocker beingyieldingly held in lnormal-position by theusual dog rocker return spring: I26;'"At its-front side the dog rockeris '35 formed with twomclosed spaced parallel and .ver-

ti'cally disposed webs="=I2l projecting forwardly .ifrom-the rocker,between which webs the upstanding arm of an angle lever I28 is closelyconfined and rockably adjustable.

on a horizontal pin-"I29 which extends between said'webs parallel toandforward of the dog r'ocker pivot fi and "is held to-said webs. Two-fo're and aft extending adjusting. screws I39 arethreadedthrough thedog rocker, one above and the other below the rocker pivot and bearagainstthe-rear edge of the'upstanding arm of -Iever I28 respectivelyabove :and below pivot pin 129 to hold the' lever against rocking on itsv pivot pin with the lever in selected adjusted relation to the dogrocker. 1 Suitable lock nuts "liit are threaded on screws I30. Lever I28has a forwardly "extending arm projecting'from the -lower 'end of-itsupstanding arm. A rigid escapement-tripping pulllink I3I is connected atits 'upper' -end to "the forward end of said forwardlyextending ar m'oflever 128 by a horizontal pivot I32 for swinging of said link fore andaft' of the machine by 'means hereinafter described. y Below thelever"-I 28 ,"and substantially directly below the pivot I29 thereof andin rear of the frel'ease'b'ar 'rock shaft 69, is a short horizontalrock'shaft I33 which extends transversely of the 'machine ariddsmediallylocated between the sidesof the'inachine, said rock shaft I33 beingjournaled at its ends on the framework H] at --'I34.'" Ffixed'to shaftI33 substantially midway between theends of said shaft is a narrowforw'a'rdly extending yoke which comprises a pair of parallel forwardlyextending and closely transversely'spaced side arms I35 (fixed to saidshaft) andqa lso' ashort horizontal cross pin I35 fixed --at itsends tothe forward ends of said side arms.

' The link I3I extends downward through this This lever 0'arm is pivotedsubstantially midway its ends yoke I I 36, maximum fore' and aftmovements of the link being limited by shaft I 33 and pin I36 andsidewise movements of the link-beinglimited by arms I35. The forwardedge of link I 3| is recessed adjacent the lower end of-thelink toprovide 1 a .hook l I31 which is normally engaged with andunder crosspin I36 of the yoke I35- I36. The shaft I33, arms I38 and I51(hereinafter described) and yoke I35--I36 form an es.- capement'trippingtappet devicenormally coactive with the hook deviceI3I-I31.

Shaft I33 has fixed thereto totheleftof the yoke I35I36 a pendent rockarm I38 which carries at its lower end a laterally extendin pin or studI39 movableback and forth in a'short fore and aft extending arcuate-slotI40 in-a pendent arm MI loosely pivoted at'its upper end onvshaft I33.Substantially directlyabove shaft I33 and forward of the constantlyrunning power shaft 49,

there is fixed to framework I0 a shortrod I42 which extendshorizontallytransversely of the machin and is located substantiallymedially of the sides. of the machine. A torsion spring I43 wrappedaround this. rod has its oppositeends abutting shaft I33 and a pin.I44on link I3I'to, I

normally hold-the link pressed. forward against pin I36 of yoke I35.I36with the hook I31 on said link engaged with-and under said pin I36.

A torsion spring I 45 wrapped around shaft .I33

has its opposite ends engaged with rod I42 andz with pin I39 on rock armI38 to normally hold said pin I39 engaged with the forward end of slotI40 in the pivoted arm I4 I. The lower. end of the freely pivoted arm MIis connected 1by;a rigid forwardly and downwardly extending link I46 tothe rear end of anormally forwardly and downwardly extending rock armI41 fixed on the rockshaft 34, to which shaft 34 they type baractuator33 is also. fixed as previously described,

thu providing av toggle for actuating the escape--'.

ment tripping tappet device. V 7

An escapement disablingrockshaft I48 extends horizontally transverselyof th machineacross the entire system of type actions, saidshaft-beingjournaled at, its ends at I49 on framework I0 and passing between yokeI35,I 36 and the link I46 forward of arm MI and in rear of thesub-levers I08. For each type key I00 of the keyboard selectedtofunction as a silent or accent key, there is detachably clamped to shaftI 48 a J- shaped tappet I50 which extends forwardly from said shaft, twosuch tappets for two different keys being shown in Figure 1. It will beunderstood that as many of these tappets as desired may be employed.Eachsuch tappet is clamped to shaft I48 by a clamping screw I5I engagedwith the legs thereof with shaft I48 between said screws and the bendconnecting the legs of the framework I0, normally urges said shaftclock- -wise as viewed in Figures 2 and 11 to urge a stop---I55,:held.to said shaft, against a stop I56 fixed :onframework I0, tothereby normally yieldingly hold tappets I50-I5I and I'52I53 positionedas shown. Stop I is constructed similarly to tappets I50I5I for clampingof the stop to shaft I48 vin different adjusted positions about saidshaft. The shaft I48, and the several arms or tappets I5I and I52 fixedthereto, form a springreturnedescapement disabling tappet device.

The spring-returned escapement tripping tappet device, comprising theshaft I33, arms I38 and I51, and yoke I35I36, is also manually rockableby a space bar I63 in the keyboard portion ly yieldingly maintains pinI58.at the forwar end. of slot I59.

,To the lower end of arm I60 there is pivoted at llil the rear end of along fore-and-aft extending space-bar-actuated link- I62 located substantially. midway between the sides of the machine The space bar I63 islocated forward of the rows of type keys I00 of the keyboardand .will behereinafter more particularly described in connection with other detailsof the keyboard portion of the machine. Belowand forward of the frontrow of type keys of the keyboard there is journaled in the framework I0ahorizontal rock shaft. I65 which extends transversely of the ma- 40ends are two forwardly extending rock arms I66 chine. Fixed to thisshaft adjacent itsv opposite connected atptheir forward ends, byhorizontal pivots I61- which extend transversely of the machine, to tworearwardly extending brackets I68 J-shaped tappet. The longer leg ofeach tappet extends forwardly to immediately overhang the rear portionof the desired sub-lever I08, each such tappet overhangingonly a singlesub-lever. Each tappet employed is adjustably clamped to the shaft byits screw I5I foraxial and radial adjustment respectively along andabout said,

shaft. Fixed on shaft I 48 is a rigid upstandin ppet arm I52 provided atits upper end with a laterally extending lug I53 normally disposedimmediately in front of the lower end of the escapement trip link I3Ibelow hook I31 of said link and disposed out of the paths of normalescapement tripping movements of the link I3I and yoke I35I36. A returntorsion spring I 54 (Figure 13) wrapped around shaft I48 and having itsends engaged with said shaft and withfixed to the space bar and locatedunder the top of; said space bar. Two fore-and-aft extending links I69,parallel to and at a higher level than arms I68, are pivoted at theirforward ends at .I10 to'brackets I68and at their rear ends at "Ito;framework; I0 above the shaft I65 for up and down rocking of saidlinks in parallelism with said arms. Substantially midway its ends andsubstantially medially of the sides'of the machine, the rock shaft I65has fixed thereto. a pendent rock arm I12, the lower end of which arm isconnected by ahorizontal transversely extending pivot I13 to the forwardend of the space baractuated link I62 above described. A pair of spacebar return springs: I14, anchored to the space bar and to framework I0,yieldinglyhold the space bar and its connected escapement operatingtrain l69I66-I12-I62-I60 normally positioned as shown, while arm MI andits connecting train I46I4'1 to the. actuator.- 33 are normallypositively held positioned as shown by thenormally retracted and latchedactuator 33, 'andthe escapementtripping tappetdevice I38-.- -I51-.-I33-I 35l 36 is normally yieldinglyheld-as .shown by spring I45.The. space .bar return springs I14 normally yieldingly hold one headof adouble-headed cushion stop. I15, fixed'on rock arm I12, pulled forwardagainst a pendentstop finger I16 formed on a part of framework I0whichfinger is permanently bendablefore-andaft .of the machine, anddepression of'the space bar is limited by engagement of the other headconnection to said device. The lost-motion in these two connections isnormally taken up by the action of spring I45 on pin I39. Rocking of theescapement disabling device (comprisingparts I52, I53, I55, M8 and oneor more ofthe tappets i5l-I5l) by depression of a silent, dead oraccen't type key swings escapemen't trip linkl3l rearward to disconnectits hook 131 from "pin lifiof theescapement tripping tappetdevice on thedown stroke of the key prior to release of the actuator 33 and preventsactuation'of the escapement dog rocker 5 by the ensuing type-impressingoperation of the actuator 33.

When any type key is depressed and released, the actuator 33 will moveforward. and then be retracted and latched; as above described, to

' cause the associated typebar to print and-permit return of the typebar. If the keyis one of the ordinaryor live-keys, the reciprocation ofthe actuator will trip the escapement to feed the platen carriage oneletter" space, but, if the actuatedtypgkey is a dead or accent key, the

rear end of its associated sub-lever I08 will, when lifted by manualdepression of the key, rock the associated dead key tappet l50-l5|' tothereby rock the shaft M3 andthe escapement diasabling tappet l52l53 onsaid shaft to swing link'l3l dog rocker is power actuated concomitantlywith a type bar, said dog rocker is likewise spring-impelled andspring-returned.

The main framework of the machine includes a base casting having sidewalls It, a rear wall l and a front wall It. secured, by screws H8, aflat keyboard guard plate '59 which inclines downwardly and forwardly tothe top inner edge of front wall l0 of the casting. All of the keys ofthe keyboard (including the type keys I00 and the usual special keys)are disposed in an inclined plane parallel to'that of plate I19, and theplate is provided with circular apertures 180 (one for each such key).The keys normally protrude through these apertures with their lowerportions loosely engaged in the apertures, and the dimer the keys issuch that their tops are substantially flush with the top face of the*plate at the lower limit of key depression, the tops of the keys beinginclined parallel to said plate. The dip of the keysand.

To this casting ther is space bar are all equal and of very slightextent,

namely about one-eighth of an inch; one purpose of the constructionshown being toprovide for such slight uniformkey and space bar dip.

The front wall 10 of the base casting is recessed along its top-and"front atv l8l and I82, respectively, between the ends-of said wall toaccom- -modate the spacebar and its supporting means and return springs,and-permit the slight operative depression ofthe. space bar, with thespace a bar located withinthe confines of the front and side walls[Me-Ill The space fba'r is formed of sheet metal or'rigidsheet'mate'rial and has aflat,

forwardly and downwardly inclined topfportion 1E3, disposed in a planeparallel to theplanes of plate H9 and the keys I00 andnormally 'l ocatedin a plane intermediate those of the plate and the key tops; forengagement by a thumb of the typist to depress the space bar. The rearedge of part 163%015 the space baris provided'with a pendentstifiening'flange IMP-opposed to the'front'edge of plate H9;Pendentfromthe front edge of part I63 of the space bar is a skirtportion I63 extending downward substantially" to the bottom'of the basecasting-in front of recess 182- in the front wall of the casting andin'iront'of springs I14 which are-anchored at their lower ends to pinsI14 on this'ski'rt. The skirt is flush with the front face-of theend-portions of'the front wall lll -ofthe base'casting. i A compactkeyboard'and space bar assembly inwh'ich' the keys an d space bar'may beeasily and comfortably manipulated is thus provided. f

The concept of combining a series of springreturned type bars andaspring returned escapementdog carrier'with a normally-idlekey-controlled" and power-actuated tappet mechanism which isspring-impelled to concomitantly acti-. 'vate the dog carrier and akey-selected type bar in opposition to the'returnspring force constantlyexerted on said dog carrier and; type bar, afiords .cannot positivelyjam an escapementdog'ag'ainst theescapement wheel-upon sluggish letterfeed movement of the carriage and thereby. either a damage theescapemen't dog or wheel. and/ or power mechanism or jam the machineagainst operation with the parts out'of normal" position.

The further concept 'of embodying in said tappet mechanis'm'a universaltype bar impelling tappet, and also a spring-returned dog-rocker.-

-impelling tappet operable "in opposition to its return spring fromthef'type barimpelling tappet by a purelythrust connection or tappetlike actlon, and of combining with said two tappets a manually operatedand spring-returned space bar having a solely one-way thrust connectionwith the dog rocker impelling tappetfor rocking the latter in oppositionto its return spring, provides simple and effective means wher eby theescape- -ment may be tripped by'the power-actuated type 'bar impellingtappetwithout moving the space bar and may be trippedf by the' space barwithout causing a'power actuation of the type bar impelling tappet, V r

The furtherconcept ment tripping interponent yieldingly normallyinterposed for actuation by the dog rocker impelling tappetof the poweractuated tappet mechanism, and of associating with said interponent aspring-returned; escapement disabling tappet manuallyoperable by anypredetermined onegor *ones, of the keys during depressingpf the latterto shift'the interponent temporarily-out of the path of the dog rockerimpelling tappet,--afiords a simple and compact and eflicientarrangement ,wherebyeny 1predetermined one or onesof, the

keys may function as silent or; accent keys for effecting printingwithout-letter spacings a The construction and arrangement of the partsconstituting the keyboard portion of the machine permitsactuation of thekeys and space bar with maximum ease and comfort and a minimum ofexertion, and also provides a compact keyboard portion which has apleasing appearanceand, also reduces the length ofthe machine.

llt will be observed also that the construction and arrangement of thepower actuated-tappet mechanism andof the key operatedjmechanism tappetactionor thrust action in one direction" only, andthe concept of such anassembly of mechanisms ordevices makes possible precise relativeadjustments between the several inter- ..related mechanisms or devicesfor correct, and eflicientaction. and also makespossible separateassembly of the seyeraldevices ormechanisms for more facileandcorrectassembly of the'parts of the machine. I

The key-operated trains are adjustable relatively tothe couplers 26 andthe type bars con- 'nectedtherewitnand are operative on the couplerswitha tappet action; the release bar 68 and the actuator 33 are separately,adjustable relative- 1y to the couplers which act on the release barwith a tappet action{ the escapement tripping tappet accommodates itselfto: adjustments-of actuator 33 and the spacebar, both of which areeffective ,on said tappet solely with a tappetor thrust action in onedirection only; theescapement tripping tappet acts onlink l3l with atappet action.

and this link is adjustable relatively to the tappet by reasonof itsadjustable anchorage ,to the:escapeme'nt dog rocker; and the dead oraccent key tappet device is actuated by a tappet action'thereon ofpredetermined ones ,of-the, sub-levers I08.

and is operable upon; link -I 3] with respectgto which, and to the keyoperated mechanisms which act on said dead key tappet device, the latteris adjustable by reason of the adjustable clamping anschorages ofelements I5 0 and-stop I55 to shaft The provision of the aforesaidcorrelated assembly or interactive tappet devices or mechanismsconstitutes one'important featureofgthe :inventive conceptionegemplifiedby the construcof providing an escapemove the same in one directiononly.

.tion illustrated in the drawings and described above. J l

; I, claim: ,7 I

1. In a typewriting machine, the combination of a platen carriage, aplaten on the carriage, a

actuator, spring means for impelling said actuator in one direction,superior power means ,for

retracting the actuator against the power of said spring means,interponents connected with the respective type carriers and normallyout of the field of movement of the universal actuator, type keys, aninterponent setting train for each type key and interp onent and eachoperable by depression of its associated key to engage and set itsassociated interponent for actuation by the universal actuator on thespring-impelled stroke of the latter to propel the associated typecarrier toward the platen, means operable by setting movement of anyoneof said interponents torelease the universal actuator for a singlevibration of said universal actuator by its impelling spring means andthe a superior power means and to thereupon lock the actuator inretracted position; a separableactuatingtrainbetween the universalactuator and'the escapement dog carrier the separable, portions; ofwhichare connected respectively to the dog carrier and the universalactuator, a return spring for the dog carrier and the portion of saiddog carrier actuating train connected with the carrier, a return springfor each keyand its associated interponent setting train,

;a return spring for each type carrier and its associated interponent,and a spring-returned escapement disabling device operable byinterponent setting movement of one or more of the ,interponent settingtrains to separate the dog carrier actuating train to prevent actuationof thedog carrier by the universal actuator.

. '2. In a poweractuated typewriting machine, the combination of aplaten carriage, a platen thereon, spring-returned printinginstrumentalities, a carriage escapementincluding a spring-returnedescapement dog rocker, individual type key controlled mechanismsforselectively conditioning the respective printing instrumentalitiesfor printing actuation, a single actuating mechanism for concomitantlyactuating both the dog rock- -er and any selected printinginstrumentality in opposition; to the return spring power exerted onsaid rocker and instrumentality, a motor constantly driven while themachine is in use, spring means ior'impelling said actuating mechanismto actuate the dogrocker and selected printing instrumentality inopposition to the return spring power exerted on the rocker and selectedprinting instrumentality, and means controllable by each of saidkey-controlled mechanisms to release said actuating mechanism for springimpulsion thereof and-to thereafter first connect said mech- -.anismtosaid motor for motor actuation of said mechanism in'opposition to thepower of its impelling spring means and then disconnect said motor fromsaid mechanism and hold the latter against operation by its impellingspring means, said single actuating mechanism for concomitantlyactuating the dog rocker and selected printing instrumentality beingoperable thereon to .trolled printing instrumentality selecting mech-=7,5

anismstopreventactuation of the dog rocker to positively move a typecarrier to its printing limit, spring means for returningieach .typecarrier and its individual actuating means to normal position followingactuation thereof by the actuator, a platen'carriage, a platen on thecarriage with which the type carriers are coactive toeffect printingimpressionsyan ascapem'entfor'letter spacing the carriage including aspring returned escapement dog rocker, a spring returnedescapement-actuatingtappet devicefor actuating the 'dog rocker inopposition to the return spring power exerted on the dog rocker; andmeans positively connected with the universal actuator and having athrust connection only with said tappet device for moving the latter, inopposition to the return spring power exerted on said device, duringtype carrierimpelling.strokes of the universal actuatorr l 5. A poweractuated typewriting'machine, as claimed inclaim'4, wherein theconnectionbetween the escapement actuating tappet device and the dogrocker comprises a' hook normally spring held in position for actuationby the escapement-actuating tappet device, and wherein a spring-returnedescapement-disabling device is providedhaving one or more tappetelementsior manual actuation of said device by one or more of thetype'keys and also having a tappet element operable upon said hook'toshift the latter out of operative relation to the escapement ac; tuatingtappet device to thereby permit, typing operation of selected typecarriers of'the machine without concomitantletter spacing, of the car.-

riage. a

6. A typewriting machine, as claimed 'ina'claim 2, wherein the impellingspring means "for said single mechanism 'for concomitantly" actuatingthe dog rocker and a selected 1 rinting. instrumentality comprisesconstantly tensioned 'im-' pelling spring means anchored to saidmechanism and to the framework of the machine, an auxiliary impellingspring means anchored to said mechanism, and anchoring means on theframework of the machine fortsaidauxiliary 7 spring means manuallyadjustable to vary/F the force exerted by the: auxiliary springJmeans-"on said mechanism, to thereby vary the spring forcetransmissible by said mechanism to the 'dogrocker and type carriers ofthe machine.

'7. In a'typewriting machine, the combination of a platen carriage, aplaten on the carriage, an escapement for the carriage including aspring returned dog rocker type bars coactive with'the actionoi theactuator, power means controlled by each driver tocause a singlereciprocation of the actuator when the associated sub-lever is actuated,a separable connection between the dog rocker and actuator for operatingthe'dog rocker inopposition to the return spring-force exerted on thelatter, and a spring-returned 'escapement disabling device ope able onsaid sep-.

arable connection toxtemporarilyibreak the lat ter and includingportions engageable by selected ones of the sub-leversto actuate saiddevice.

8. Ina typewriting machine, the combination of a mainframe, a platencarriage mounted on the main frame to. traveltransversely thereof, aplaten on the carriage, a system of type bars located below and in frontof the platenand supported in the main frame for upward and rearwardswinging of any selected tyIpe' bar to the platen for printing coactionwith the platen, a carriage feeding escapement includinga foreand-aftrockable dog rocker located'behind the system of type bars, afo-re-and-aft rockable type bar actuating bail located between and belowthe dog rocker and, type floarsystem and having a horizontal cross-barextending transversely of the machine and pendent side arms pivoted onthev main frame, an operating connection between said actuator and dogrocker, a row of ,fore-and-aft extending type bar driving interponentspositively connected with the type bars and normally alignedhorizontally and transversely of the machine out of the field ofmovement of the:- cross-bar of the type bar actuator and each having afinger normally extending under said cross-baranda rearwardly facingshoulder moyalbleupward into the fieid of movement ofisaidcross-bar,return spring means for each type bar and itsv connected interponent,' asystem of sub-levers. fulcr-umed for rocking about ahorizontal axisextending transversely of the machine forward of the system ofinterponents and each extending downward and then rearward below thesystem of interponents through said type bar actuating lbail, a row offore-and-ait extending links connected at their rear ends to thedownwardly extending portions of'the' sub-levers, a system of type keycarrying'levers having upturned key-carrying front end portions'andalso-having upturned rear end portions fulcrumed'at their upper ends onthe main frame for'swinging about a common horizontal axis extendingtransversely'of the machine below the system of type bars, return springmeans for each connected key-carrying lever and sub-lever and link,means carried by each sub-lever for shifting a difierentone of theinterponents upwardly to position its rearwardly facingshoulder'directly in advanceof the crossbar of the actuating bailtoreceive a blow from said cross-bar, and power means controlled bylifting movement of any one of said intenponents to rock said actuatingbail first'forward and then rearward and thereafter hold the bailinnormal retracted position.

9. A typewriting machine asclaimedin' claim 8, wherein the key leversare of different length to support the keys infour rows extending acrossthe machine, the sub-levers are all identical, and the links connectingthe key-carrying'levers and s'ub-levers'are all of the same lengthandare connected'to the downwardly extending portions of the sulb-leversat different elevations for the different rows of: keys for uniform dip.of'all' keys and uniform rocking of the sub-leversrby'the keys.

10. A'typewriting machine as claimed in claim 8, wherein the key leversare of different length to support the keys in four rows extendingacross the machine, the sub-levers are all identical, and the linksconnecting the key-carrying levers and sub-levers are allof the samelength and are connected to the downwardly extending portions of thesub-levers at different elevations-for the different'rows of keys foruniform dip of all keys and uniform rocking of the sub-levers by thekeys, the tops of all of the keys are normally disposed in a singledownwardly and forwardly inclined plane, and a guard plate is held tothe main frame in a plane parallel to that of the key tops and hasperforations in which the keys are movable down and up, and aspring-returned space bar connected to said dog rocker is mounte edwithin the forward limit of the main frame forward of the keys, issupported in advance of the guard plate for depression to actuate thedog rocker, and has a top thumb-impact receiving surface inclined in aplane parallel to and intermediate those of the key tops and guardplate.

11. A typewriting machine as claimed in claim 8,-wherein the key leversare of different length to support the keys in four rows extendingacross the machine, the sub-levers are all identical, and the'linksconnecting the key-carrying levers and sub-levers are all of the samelength and ,are connected to the downwardly extending portions of thesub-levers at different elevations for the different rows of keys foruniform dip of all keys and uniform rocking of the sub-levers by thekeys, the tops of all of the keys are normally disposed in a singledownwardly and forwardly inclined plane, and a guard plate is held tothe main frame in a plane parallel to that of the key tops and hasperforations in which the keys are movable down and up. r V

12. In a typewriting machine, the combination of a main frame, a systemof normally forwardly I extending type bars mounted in the frame forupward and rearward swinging of the type bars to-print, a type baractuator mounted on the frame for fore-and-aft movement and having astraight type bar impelling edge extendin horizontally transversely ofthe machine, a row of identical fore-and-aft extending type bar drivinginterponents positively connected to the type bars and normally alignedhorizontally transversely of the machine, each interponent having arearwardly facing shoulder presentable in front of said actuator edge byupwardgmovement of the interponent, return spring means for each typebar and its-driving interponent, a row of identical sub-levers normallyaligned horizontally transversely of the machine and each having anupstanding forward portion and a portion extending rearward below therowof interponents, means supporting the upstanding portions of thesub-levers for rocking about a common straight. horizontal axisextending transversely of the machine, means on the main frame forsupporting the interponents in their normal returned position,interponent lifting means carried by the rearwardly extendingporsub-levers for uniform dip of all the keys and uniform rocking .ofthe sub-levers by key pression.

13'. In a typewriting" machine, the combination of a normally idle andreciprocably mounted type carrier actuator, individual-type key operatedmeansfor selecting a typecarrier for actuation, power-operated means foreffecting a single re ciprocation' ofi said .actuatorzupon ,actuation ofany one of saidtype key operatedmeans, a second actuator I for actuatingthe letter spacing means of the machine having a lost-motion connection'with said type carrier actuator for. actuation ofthe.secondvactuator'bythe type carrier actuator, means normally andseparably en aged Withsaid second actuator for' operation by the latterto actuaterthe letter spacing meansl of the machine, a disabling deviceoperable on the lastmentionedimeans todisconnect'it from the secondactuator, a plurality of 'tappets detachably heldto thedisablinglgdevice for engagement by selected ones of the "key operatedmeans to cause saididisabling' device to temporarily disconnect theseparably engaged means from the second actuator, and a space bar'havinga lost-motion operating connection with the second actuator to manuallyoperate thesecond actuator independe ently of actuation ofthe typecarrier actuator.

14. Ina typewriting machine, the combination of aplaten carriage, a:platen on the carriage, a letter feed escapement for said carriageincluding' a spring-returned escapement dogrocker, spring-returnedindividual type bar actuating means, type bars each coactivewith' theplaten and positively connected with a different one of said individualtype bar actuating means, a tappet mechanism, spring means for actuatingsaid tappet mechanism to concomitantly impel the dog rocker and anyselected one of said individual type bar actuating meansin opposition tothe return spring force exerted on said dog rocker.' and the selectedtype .bar actuatingmeans to trip the carriage escapement and effect atype impression, a single cycle power mechanism for automaticallyrestoring the tappet mechanism following each actuation of said tappetmechanism by its actuating spring means and releasablyuholding saidtappet mechanism in restored condition, type keys for the respectivetype bars, and a plurality of individual spring-returned means eachpositively connected with a different type key for manual operationthereof upon depression of its connected key to concomitantly releasethe tappet mechanism and condition the individual actuating means forthe associated one of the type bars to receive an impelling blow fromthetappet mechanism upon the ensuing spring actuation of the releasedtappet mechanism 7 15. A typewriting machine according to claim14,;wherein:the'tappet mechanism comprises an escapement tripping tappetand an actuating tappet'for. the several individual type bar actuatingmeans, whereina tripping element is pivotally held to the escapement dogrocker for swinging of said element into and out of the field ofmovement of the escapement tripping tappet and is normally yieldinglyheld positioned for actuation by said tappet, and whereinmeans'areprovided operableby one of said individual type key oper ated means,upon depression of the associated type key, to swing said trippingelement out of the field of action of the escapement tripping tappet; 1g i 16. In a typewriting machine, a platen carriage, a platen on thecarriage, a, carriage escapementincluding'a spring returned. escapementdog rocker,--an oppositelyshiftable and normally idle type carrieractuatontype carriers normally dis,- connected from said actuator,spring means for moving said actuator from idle position to impart aprinting stroke to any selected one of the type carriers, superior powermeans for automatically restoring the actuator to idle position, meansfor automatically releasably locking the actuator in idle position uponrestoration of the actuator, type keys for the respective type carriers,means operable by depression of either one of the type keys toconcomitantly release the actuator from said locking means and establisha driving connection between the actuator and the type carrierassociated with the depressed key, an element positively connected withsaid actuator for opposite shifting of the element by the actuator, anoppositely shiftable dog rocker tripping tappet, a return spring forsaid tappet normally yieldingly holding said tappet thrust against saidelement for movement of the tappet by said element on the springimpelled strokes of the type carrier actuator, a hook pivoted to the dogrocker, a spring connected with said hook to normally hold said hookswung into the field of action of the dog rocker tripping tappet foractuation to rock the dog rocker in opposition to its return spring onthe spring impelled strokes of the type carrier actuator, aspring-returned escapement-disabling tappet device, and tappet meansoperable by one of the type keys upon key depression to actuateescapement disablin tappet device to cause the latter to swing said hookout of the field of action of the dog rocker tripping tappet.

17. In a typewriting machine, a platen carriage, a platen on thecarriage, an escapement for the carriage including a spring-returnedelement movable in opposition to the return spring force imposed thereonfor tripping the escapement, a tappet for so moving said element, typecarriers, selecting keys for the type carriers, and power actuated meanscontrolled by the respective keys for concomitantly actuating saidtappet and a selected type carrier.

18. A typwriting machine,-as claimed in claim 1'7, having aspring-returned manually depressible space bar, and an elementpositively oppositely shiftable by said bar, and wherein said tappet ismovable independently of the power mechanism and said element and isnormally yieldingly held in position for thrust actuation of said tappetby said element during the down strokes of the space bar and by saidpower mechanism during printing strokes of the type carriers.

19. In a key-controlled power-actuated typewriting machine, .a mainframework including a base casting having side and rear and front wallsof a low maximum height not substantially exceeding the maximum heightof the keyboard of the machine, four parallel rows of downwardly andforwardly inclined spring-returned manually depressible type keys alllying in a single downwardly and forwardly inclined plane and locatedwithin the front portion of said base casting with the front one of saidrows of keys close to the front wall of said casting, the front wall ofsaid casting being recessed along both its top and front facesintermediate its ends, a flat forwardly and downwardly inclined guardplate fixed to said base casting and extending rearward beyond thekeyboard from the upper edge of the front wall of said casting andhaving four rows of apertures from which the type keys protrude upward,a manually depressible and spring returned space bar movable down and upin and ill substantially covering the recesses in the front wall ofsaid" casting and having a flat downwardly and forwardly inclined thumbimpact receiving top surface normally disposed in a plane parallel toand intermediate those of the type key tops and said guard plate, meansfor limiting depress ing and return strokes of the type keys, means forlimiting depressing and return strokes of the space bar to an extentsubstantially equal to those of the type keys, the depression limit ofthe typekeys being such that their impact receiving top faces aredepressible substantially to the plane of said guard plate, a platencarriage supported on the framework to travel transversely of themachine above the rear portion of the base casting, a platen on thecarriage. a system of type bars supported above the base castingintermediate the platen and keyboard, an escapement for the carriage,normally inactive power actuated mechanism for actuating the escapementand type bars located within the rear portion of the 'base casting, anoperating connection between the escapement and power mechanism,individual normally ineffective operating connections between the typebars and power mechanism, means operable by the type keys and locatedwithin the base casting for activating the power mechanism for a singlecycle of operation and selectively rendering the individual connectionsbetween the type bars and power mechanism efiective, means locatedwithin the base casting and operable by the space bar to manually tripthe escapement through a part of the operating connection between theescapement and said power mechanism, and activating power means for saidpower actuated mechanism located within the framework.

20. In a typewriting machine, the combination of a platen carriage, aplaten on the carriage, spring-returned type carriers bearing typescoactive With the platen, a letter feed escapement for the carriageincluding a spring-returned escapement dog carrier, a spring-returnedtappet for actuating the dog rocker, a power-actuated tappet mechanismfor concomitantly actuating any selected one of the type carriers andsaid dog rocker actuating tappet in opposition to the return springforces exerted on said tappet and selected type carrier, spring meansfor impelling said power-actuated tappet mechanism to 50 actuate the dogrocker actuating tappet and selected type carrier, power means forretracting said power-actuated tappet mechanism in opposition to saidspring means and holding said mechanism retracted, driving interponentspositively connected with the respective type carriers and normally outof the field of action of said poweractuated tappet mechanism,spring-returned tappet devices individually operable on the respectivedriving interponents to position any selected interponent for driving ofthe latter by the power-actuated tappet mechanism upon spring impulsionof said mechanism, spring-returned means engageable and shiftable by theselected coupler upon positioning movement of the latter by itsassociated actuating tappet device to release the power-actuated tappetmechanism for impulsion of the latter by said spring means, and aspring-returned tappet means operable on said dog rocker actuatingtappet independently of said power-actuated tappet mechanism foreffecting letter spacing of the carriage without printing.

21. A typewriting machine, as claimed in claim 20, having avspring-returned escapement-disabling tappet device operable by eitherone of a selected plurality of said interponent positioning tappetdevices, and a'dog rocker actuating interponent connected with the dogrocker and normally yieldingly held positioned for actuation by the dogrocker actuating tappet and movable out of the field of action of thelatter I by said escapement-disabling tappet.

22. A typewriting machine, as claimed in claim 20, wherein theinterponent positioning tappet devices are each'individually adjustablew ponent toward and from its actuating tappet.

CHARLES WALKER.

